21334454787 has 16 divisors (see below), whose sum is σ = 28985665280. Its totient is φ = 13955641632.

The previous prime is 21334454777. The next prime is 21334454803. The reversal of 21334454787 is 78745443312.

It is not a de Polignac number, because 21334454787 - 2¹¹ = 21334452739 is a prime.

It is a super-2 number, since 2×21334454787² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21334454767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283033 + ... + 350394.

It is an arithmetic number, because the mean of its divisors is an integer number (1811604080).

Almost surely, 2^21334454787 is an apocalyptic number.

21334454787 is a deficient number, since it is larger than the sum of its proper divisors (7651210493).

21334454787 is a wasteful number, since it uses less digits than its factorization.

21334454787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633642.

The product of its digits is 2257920, while the sum is 48.

The spelling of 21334454787 in words is "twenty-one billion, three hundred thirty-four million, four hundred fifty-four thousand, seven hundred eighty-seven".